MAGNESIUM (THY)
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- A magnesium blood test measures the amount of magnesium in your blood.
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- A magnesium blood test measures the amount of magnesium in your blood. Magnesium is a type of electrolyte. Electrolytes are electrically charged minerals that are responsible for many important functions and processes in your body. Your body needs magnesium to help your muscles, nerves, and heart work properly.